Ways to convert double to string in C++

There are various ways of converting string to double in the C language; but before going into the ways, let me give you a quick intro to string and double.

C provides the programmers a wide variety of built-in as well as user defined data types. String and double are both data types but they differ in a few respects:

Double is a built-in/primitive data type while std::string is a part of the standard library that comes with the C compiler which can be used after including the string.h...